remove tracing page

Author: ChrisRackauckas

docs/make.jl

@@ -11,7 +11,6 @@ makedocs(
     pages=[
         "Home" => "index.md",
         "highlevel.md",
-        "tracing.md",
         "Systems" => Any[
             "systems/AbstractSystem.md",
             "systems/ODESystem.md",

docs/src/highlevel.md

@@ -16,7 +16,6 @@ and parameters. Therefore we label them as follows:
 ```julia
 using ModelingToolkit
 
-# Define some variables
 @parameters t σ ρ β
 @variables x(t) y(t) z(t)
 @derivatives D'~t